Storage management fields are for use by the subsystem only. The SSJDSTRP field in SSJD points to a chain of these control blocks. This storage is accessible to a caller but protected from modification.

Field Name

Description

JDSGEYE

Eye-catcher

JDSGSTHL

Length of header area

JDSGSTSP

Subpool of this block

JDSGSTPL

Recommended subpool to use

JDSGSTTL

Total length of this block (including this header)

JDSGNEXT

Pointer to next block

JDSGAVL

Pointer to first available byte

JDSGDATA

Start of data in the block